The Bilstein B6 is probably the best shock absorber that you can ever get for a Capri. Whilst it was specifically made as an uprated version of the Capri 2.8i unit it does in fact fit on every model of Capri and transforms the rear end.
This is a gas pressure fixed rate unit, so no fiddling with settings needed. Just trust that Bilstein have used all their experience to get the bounce and rebound settings perfect for a road going sports car type performance. The original 2.8i units were the best that factory Ford fitted and these are much better even than those.